<tr class="horarios" onclick="formatTimeFields()">
  <td><%= f.text_field :inicio, :size=>'10px',:class=>"timeEntry required", :placeholder => "08:00"%></td>
  <td><%= f.text_field :fin, :size=>'10px',:class=>"timeEntry required", :placeholder => "17:00" %></td>
  <td>
    <%= check_box_dias(f) %>
  </td>
  <td>
    <%= f.hidden_field :_destroy %>
    <%= button_to_function "Quitar", "quitarCampos(this)" %>
  </td>
</tr>